3(2-r)=21

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Solution for 3(2-r)=21 equation: 


Simplifying
3(2 + -1r) = 21
(2 * 3 + -1r * 3) = 21
(6 + -3r) = 21

Solving
6 + -3r = 21

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-6' to each side of the equation.
6 + -6 + -3r = 21 + -6

Combine like terms: 6 + -6 = 0
0 + -3r = 21 + -6
-3r = 21 + -6

Combine like terms: 21 + -6 = 15
-3r = 15

Divide each side by '-3'.
r = -5

Simplifying
r = -5

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